Lock



July 13,1926. 1,592,637

F. C. MACRI LOCK Filed May 6, 1924 Patented July 13, 1926.

UNITED STATES FRANK C. MACRI, 0F

FICE.

BROOKLYN, NEW YORK.

LOCK.

Application filed May This invention relates to looks such as are used on the doors of houses or apartments, the invention having for an object to provide a novel form of key-controlled lock characterized by clifficultyin picking, while at the same time being of simple and inexpensive construction.

For further comprehension of the inven" tion, and of the objects and advantages thereof, reference will be had to the follow ing description and accompanying drawing, and to the .appended claims in which the various novel features of the invention are more particularly set forth.

Fig. 1 of the drawing is an inside face view'of my improved lock with the cover plate removed.

Fig. 2 is .a transverse vertical sectional view taken on the line 22 of Fig. 1.

Fig. 3 is a detail face view of the lock.

Fig. 4 is a horizontal sectional view taken on the line 4.4t of Fig. 1.

Fig. 5 is a detail perspective view of the he Fig. 6 is a fragmentary vertical sectional view showing more particularly the device for swinging the key-bit to operative position in the lock.

Fig. 7 is a similar view to Fig. 6 showing the key partly withdrawn from the look.

In constructing my improved lock I provide a rectangular plate 10 which is adapt-ed to be secured, as by screws 11, to the inner face of the door to which the lock is applied, a portion of this door being indicated at 12, and of the door frame at 13. Fixed to this plate 10 are a pair of straps 15 and 16 which form guide elements for the bolt 17 which latter is slidable along the plate. The door frame 15 is provided with an ordinary keeper member 19 to receive the end of the bolt when the latter is moved to looking position.

Fixed to this bolt 17, between the two guide members 15, 16, is a plate 21 which is formed at opposite ends with the upwardly projecting fingers 22 which are adapted to be engaged by the key, as will be presently pointed out, to move the bolt from one position to the other. This plate 21 is adapted to bear on the guide strap 16 to limit the retracting movement of the bolt. A flat spring 23 is mounted on the plate 10 and bears on the bolt 17 and serves to provide a friction device acting to hold the bolt in adjusted positions. Fixed to the bolt 17, is

6, 1924. Serial No. 711,308.

cal slot 27 entered therein from the bottom upward, the upper end of this slot being slightly above the centre of the cap, this slot permitting the key-bit to swing downward against the plate 10 into operative relation to the fingers 22 carried by the bolt. The parts above described are covered by a plate 27 suitably spaced from the plate 10, this plate being formed with horizontal and vertical slots 28 and 29 respectively which accommodate the fin 24C and the key-bit.

The key employed in connection with my improved lock is of novel construction and comprises the round shank 32 having a head 33 on one end .and having the operating element or bit of the key in the form of a flat bar 34 hinged at one end to the other end of the shank, this bar being of a. thickness to be accommodated in the slot 27 which lat ter is of less width than the diameter of the shank 32. Formed in the bit 3 1 area number of ward notches 35 which .are adapted to register with suitable elements on the back of the plate 10. As here shown one of these elements is formed by the flange on the cap 26 and the others .are formed by pins or studs 36 fixed to the plate 10.

In using the key, the latter is inserted through a circular aperture in the door 12, with the bit 34 alined with the shank 32. When the end of the shank bears on the cap 26 the bit falls by gravity and lies along the plate 10 between the fingers 22 on the bolt and in close adj acence to the forward one of said fingers when the bolt is in retracted position, and by turning the key the bolt may be moved to looking position. To permit of swinging movement of the key-bit an arcuate recess 38 is formed in the flange on the cap 26. The key may be withdrawn by simply pulling on the head 83, the bit first swinging to horizontal position.

In connection with my improved look I provide a means for acting on the bit to swing the latter downward to operative position when the key is inserted in the lock. As there shown a lever 42 is fulcrumed between its ends as at 43 to a projection from the plate 10' and has its outei" end inclined as shown at 45 to form a cam ineniber adapted to be engaged by a pin 46 on the key to swing the lever when the key is inserted. The inner end of the lever is formed with an oflset &7 having an extended tip or point 48 which engages the key bit upon initial downward movement of the inner end of the level", and a shouldered element 49' whieh engages .a shouldered elemefiton the key bit to impart the final downward movement to the latter, The parts are as otherwis above described.

I Having thus described my invention what I Claim as new and desire to protect by Let- 5ers Patent of the United States is' as folows 1. In a look, a bolt formed with a pair on: elements spaced threalong for engagernent by a key to move the bolt, a plate on which said bolt is s'lidably mounted, and a key comprising a Shank and a pivoted Bit, said bit being adapted to be swung at right angles to the shank to lie along said plate and engage the said eleinents, and a lever fulrunied in the look and adapted to be moved by said key to bear on said bit when the key is inserted in the lock to cause said bit to swing downward to position adj aeent said plate.

2. In a look, a bolt formed with a pair of elements spaced therealong for engagement by a key to move the bolt, a plate on which said bolt is slidably mounted, and a key coinprising a shank and a pivoted bit, said bit being adapted to be swung at right angles to the shank to lie along said plate and en gage the said elements, and means adapted to bear on said bit when the key is inserted in the look to cause said bit to' swing down ward to position adjacent said plate, said means comprising a lever fuloruined in the lock and having at one end a cam adapted to be engagedby the key and at its other end anofl'set adapted to engae'e the said bit.

In testimony whei'eof Ihaye affixed my signature.

FRANK G. MACRI. 

